Three years ago, Serizawa was troubled with about his psychic powers. One day, he was visited by the boss, Suzuki Toichiro. Serizawa ends up trusting him since he's the first person to understand what he's going through. But Mob then brings up the fact that Serizawa is being used and tells him, "I'll be your friend." Hearing Mob say that, Serizawa... 

Meanwhile, after defeating Sho, the boss starts gathering up the energy he was sharing with his followers and turns into an energy monster.
That's how I know.
لهذا أعلم
Deshalb weiß ich das.
Por eso sé que los tuyos
no lo son realmente.
Por eso sé que los tuyos
no lo son realmente.
Et je peux te dire qu’entre vous,
y a pas d’amitié.
È per questo che lo so.
Por isso eu sei.
Поэтому понимаю,